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Analog Devices Inc./Maxim Integrated MAX6346UR46+T
- Part No.:
- MAX6346UR46+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6346UR46+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,968
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Product details
Overview
MAX6346UR46+T from Maxim Integrated is a push-pull, active-low microprocessor supervisory circuit that monitors 4.63V power supplies and asserts reset for ≥100ms after VCC rises above threshold; it operates from 1.2V to 5.5V, draws ≤1µA supply current, and is qualified for -40°C to +85°C industrial use in battery-powered systems.
For engineers reviewing the MAX6346UR46+T datasheet, MAX6346UR46+T pinout, MAX6346UR46+T application, or MAX6346UR46+T equivalent, this page delivers verified reset threshold accuracy (±2.5% over temperature), transient immunity data, SOT23-3 package compatibility, and direct alternatives for µP reset supervision in portable and embedded designs.
Technical Context
The MAX6346UR46+T implements a precision bandgap-based voltage comparator with factory-trimmed 4.63V reset threshold (±1.5% at +25°C, ±2.5% over -40°C to +85°C) and 9.5mV hysteresis to prevent chatter during brownout recovery. Its internal timing circuit guarantees minimum 100ms reset timeout after power-up.
It features ultra-low 1µA max supply current at 3V, operates down to 1.2V VCC, and rejects fast transients via built-in noise immunity-no external components required. The push-pull RESET output drives low to ≤0.3V at 1.6mA sink while asserted, and high to ≥0.8·VCC when deasserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V nominal, ±2.5% over -40°C to +85°C - ensures reliable brownout detection for 5V systems |
| Supply Current | ≤1.0µA at 3V - enables multi-year operation on coin-cell batteries |
| Reset Timeout | 100ms minimum - meets Intel-compatible power-on reset timing requirements |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep brownout and full 5V rail conditions |
| Output Type | Active-low push-pull - eliminates need for external pull-up resistor in most µP interfaces |
| Reset Hysteresis | 9.5mV - prevents oscillation near threshold during slow VCC ramp-up or noise events |
| Transient Immunity | Rejects <200µs negative glitches at 100mV overdrive - suppresses switching noise false triggers |
Pinout & Package
MAX6346UR46+T is housed in a 3-pin SOT23-3 package (JEDEC MO-178AA, land pattern 90-0179), with 1.3mm × 2.9mm footprint and 0.95mm height - compatible with high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output stage; must be low-impedance connection to system ground plane |
| 2 (RESET) | Active-low push-pull reset output | Drives low (≤0.3V @ 1.6mA) during reset; drives high (≥0.8·VCC) otherwise - directly interfaces µP reset pins without pull-up |
| 3 (VCC) | Supply input | Monitored power rail input; accepts 1.2V–5.5V; internally powers comparator, timer, and output driver |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 1µA supply current | Extends battery life in portable instrumentation and IoT edge sensors beyond 10 years on CR2032 |
| Precision 4.63V reset threshold | Matches 5V system brownout margin requirements with guaranteed ±2.5% tolerance across full temperature range |
| 100ms minimum reset timeout | Ensures complete µP initialization before release, eliminating boot failures in industrial controllers |
| No external components required | Reduces BOM count and layout area vs. discrete RC reset circuits; eliminates calibration drift |
| SOT23-3 package compatibility | Enables drop-in replacement of legacy MAX809/MAX810 in existing footprints without redesign |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Wearable ECG monitor powered by single Li-MnO₂ cell with gradual voltage decay. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output and asserts reset if VCC drops below 4.63V threshold during battery depletion. Use Value: Prevents corrupted sensor data writes to flash memory by guaranteeing clean µC reset before brownout-induced lockup. |
Use Scenario: DIN-rail mounted I/O module exposed to 48V DC field wiring with conducted transients. IC Role / Device Role / Timing Role: Monitors isolated 5V logic supply and holds µP in reset during 100ms power interruption or surge recovery. Use Value: Eliminates spurious relay actuation or analog input corruption during AC line sags or EFT bursts. |
| Smart Meter Communication Units | Automotive Body Control Modules |
|
Use Scenario: NB-IoT modem subsystem operating from backup supercapacitor during main power loss. IC Role / Device Role / Timing Role: Detects 5V rail collapse and initiates controlled shutdown sequence via µP interrupt before VCC falls below 1.2V. Use Value: Preserves last-read utility meter data in nonvolatile RAM and avoids partial firmware update corruption. |
Use Scenario: Low-power door module with CAN transceiver and wake-on-LIN functionality. IC Role / Device Role / Timing Role: Supervises 5V microcontroller supply and provides glitch-free reset assertion during ignition cycling and load-dump events. Use Value: Meets ISO 16750-2 pulse 4a/b immunity requirements without additional filtering components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3+T | 4.63V threshold, same SOT23-3 package, but 1.6µA max ICC and no guaranteed operation below 1.8V VCC | Limited to 3V/5V systems with stable supply rails; not suitable for deep brownout monitoring | Select when cost sensitivity outweighs ultra-low current and extended VCC range requirements |
| TPS3808G33DBVR | 3.3V fixed threshold, 1.6µA ICC, open-drain output requiring external pull-up, ±2% threshold accuracy | Requires board-level redesign for push-pull interface; mismatched threshold for 5V systems | Choose only if redesigning for 3.3V domain and accepting higher quiescent current |
Compared with MAX809TRD3+T and TPS3808G33DBVR, the MAX6346UR46+T uniquely combines 4.63V precision threshold, 1µA max supply current, push-pull output, and 1.2V operational floor - making it the sole option for long-life, wide-VCC-range, 5V-system reset supervision without external components.
Availability
MAX6346UR46+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter communication units, and automotive body control modules requiring stable component supply and long-term production continuity.
Supply support for MAX6346UR46+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for industrial, communications, and consumer applications, with emphasis on power efficiency and reliability.
The MAX63xx family was engineered specifically for ultra-low-power microprocessor reset supervision in battery-critical and thermally demanding environments, targeting portable, industrial, and automotive electronics.
FAQ
What is the exact reset threshold voltage of MAX6346UR46+T and how tightly is it specified?
The MAX6346UR46+T has a nominal reset threshold of 4.63V, with ±1.5% tolerance at +25°C and ±2.5% over the full -40°C to +85°C operating range. This specification is factory-trimmed and guaranteed per the datasheet's Electrical Characteristics table, ensuring consistent brownout detection in 5V systems without external calibration.
Does MAX6346UR46+T require an external pull-up resistor on its RESET pin?
No, MAX6346UR46+T does not require an external pull-up resistor because it features a push-pull active-low RESET output. The device actively drives the pin low during reset and high (≥0.8·VCC) when deasserted - enabling direct connection to standard µP reset inputs without additional components.
Can MAX6346UR46+T operate reliably when VCC drops below 2.0V?
Yes, MAX6346UR46+T is fully specified down to 1.2V VCC and guaranteed functional at 1.0V for correct reset state retention. This allows robust operation during deep brownout conditions where other supervisors fail, making it suitable for systems with weak backup supplies or supercapacitor hold-up.
How does MAX6346UR46+T handle short voltage transients on the VCC line?
MAX6346UR46+T rejects fast negative-going VCC transients up to 200µs duration when overdriven by 100mV below threshold, as shown in the Typical Operating Characteristics graph "Maximum Transient Duration vs. Reset Threshold Overdrive." This immunity prevents false resets from switching noise or EFT events.
Is MAX6346UR46+T pin-compatible with older Maxim reset ICs like MAX809?
Yes, MAX6346UR46+T uses the same SOT23-3 package and identical pinout (GND, RESET, VCC) as MAX809 series devices. It is explicitly noted in the datasheet as pin compatible, allowing direct replacement in existing layouts without PCB modification - provided the 4.63V threshold matches the system requirement.
MAX6346UR46+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6346UR46+T FAQ
1.How can I place an order for MAX6346UR46+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6346UR46+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX6346UR46+T reliable?
The price and inventory of MAX6346UR46+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6346UR46+T is usually 5 days.
3.What payment methods are accepted for MAX6346UR46+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6346UR46+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6346UR46+T?
MAX6346UR46+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6346UR46+T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX6346UR46+T?
For technical support, including MAX6346UR46+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6346UR46+T requirements.
6.How does Aetrix verify that MAX6346UR46+T is sourced from the original manufacturer or authorized distributors?
All MAX6346UR46+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX6346UR46+T meets industry standards.
7.What is the process for return or replacement of MAX6346UR46+T?
All MAX6346UR46+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6346UR46+T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX6346UR46+T part is unused and in its original packaging.
Return procedure for MAX6346UR46+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6346UR46+T Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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